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LED Lighting Technology and Health Robert Soler, Director of Lighting Research
• Circadian Rhythms are a daily rhythm our bodies go through • Hormone secretion • Cognition • Alertness • Productivity • Vigilance • Digestion • Bladder activity • Enzyme activity • Cell proliferation
• Light is the strongest time cue for circadian entrainment
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The Circadian System
In 2001, scientists discovered a photoreceptor that links to Suprachiasmatic Nucleus (SCN) where our master clock resides. • Does not go to the visual cortex of the
brain, like standard rods and cones • Most sensitive to specific frequencies
of blue light
More than 20% of gene expression in a given tissue has been estimated to be under circadian regulation (Reddy et al)
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New Photoreceptor
• Humans have a free running clock from 24.2-24.7 hours
• 24 hour light/dark cycle entrains our circadian clocks to 24 hours
• Electric lighting has created biological confusion in our circadian systems • Muddied the light/dark
cycle • Discovery of melanopsin has
allowed us to mitigate this problem
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24 hour cycle
Light levels we see indoors fall into the twilight range • 50 to 300 lux is what we have indoors,
equivalent to what’s available at twilight o Not enough during the day o Too much at night
90% of time is spent indoors
• People in western region of time zone are more prone to circadian problems (such as SAD)
• Increased chance of waking up in darkness • Shows the importance of early morning
biological light
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Modern Society’s Clock
Light levels were designed without biology in mind • Lighting Standards were
built around visual performance • Saturation is in 100s
of lux. • Additional light would be
a waste of energy
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Visual Performance
NREL Outdoor signal throughout the day summer and winter in Cleveland, Boise, Boulder, and Portland (ME)
*Assumes sunglasses are worn when outside: 20% transmission Lighting Science Group Proprietary and Confidential
Typical Daylight Signal
Typical light signal throughout a worker’s day (8am-5pm) Lighting Science Group
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Standard 8-5 work environment
Daylight Signal for the Workforce
Remember when computers were obsolete after 6 months?...in 2000
Devices Connected to the Internet of Things
2012 20208.5 Billion
75 Billion
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• Moore’s law hit a theoretical peak in 2004
• Processing power became trivial
• Opened opportunities to do more with the technology
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The Processing Peak
2007 iPhone 2010 iPad 2013 Google Glass 2008 Cloud Lighting Science Group
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Processor Efficiency Hit a Peak
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Phosphor coated - Warm Phosphor coated - Cool
The Processing Peak
The Efficiency Peak
TODAY
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LED Efficiency Approaching Peak
• By understanding peak sensitivities of the biological systems we can maximize efficiency
• LED can be spectrally dialed in
• Focus the energy used on the biological effect
Sensitivity
LED spectral pallate
Biological Light
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Metamers - Demonstration
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Note: Light levels go from 25lux to 250lux (Camera is correcting)
Spectral Timing
• Studies show Blue enriched light is most effective in the morning
• Simulated dawn (slow ramping of light) has a better effect that early morning bright light
• Red before blue light is better than blue light alone
•Using LED lighting, we can bring in the biologically significant daylight spectrums
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Bringing in the Daylight
Thank You Questions or more information
Contact info:
Robert.soler@lsgc.com
321-779-5548
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